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  • was your answer judged as incorrect? I think the provided solution just have an intention of exposing some knowledge of string concatenation to the user; and it is indeed the purpose of an exercise. Commented Nov 5, 2014 at 8:09
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    I much prefer your code; adding up strings by concatenation should generally be avoided, and the single line will be more efficient than an explicit loop. My only issue is with shadowing str, but I guess you were provided with the function definition. Commented Nov 5, 2014 at 8:10
  • as @YohanesKhosiawan许先汉 wrote. The answer uses concepts likes ranges and a for loop and is much easier to expand, e.g. other delimiters between the copies. Your solution is clean for the purpose but hides the functionality a bit. Commented Nov 5, 2014 at 8:13
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    @GingerPlusPlus using str as a variable name prevents you from accessing the built-in type. Commented Nov 5, 2014 at 9:08
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    Basically, if you understand what the other code is doing (it's always worth learning from alternative approaches and implementations), don't worry about it. You wrote code that met the spec and passed the tests: good job, that's programming. Commented Nov 5, 2014 at 9:49

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